The BC version of her: [npc=18141]
She was an important part of the Mag'har questline in Nagrand. Her relationship to Durotan and Thrall was revealed in dialog that was part of There Is No Hope.
Elite
Greatmother Geyah
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Mother of Durotan and Grandmother of Thrall
Geneticaly, she is. Thrall consider her as his grandmother, and WoD Durotan as his father as well, no matter the timeline.
Details
This roster comes from the current game client's data files, so it is not a complete list of every NPC in the game - older world NPCs that are no longer in the modern client are absent.
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Level and Map Tracking
The game data tunes Greatmother Geyah for levels 10 to 40, Warlords of Draenor content.